// This class is to test the basic function of this compiler.
class BasicTest{
	public static void main(String[] a){
		System.out.println(new Fac().ComputeFac(4));
	}
}

class Fac {
	public int ComputeFac(int num){
		int num_aux ;
		if (num < 1)
			num_aux = 1 ;
		else 
			num_aux = num * (this.ComputeFac(num-1)) ;
		return num_aux ;
	}
}
